Not Ranked
You can quiet those gilmer drives down by drilling a small hole in the middle of each groove in the pulleys. The noise is caused by the air getting pushed out as the belt engages each tooth as the pulley turns. Drilling the hole gives the air an escape path. It will still whine but not as loud.
Also you can loosen the belt a little and it will quiet down. They don't need to be that tight as it's the teeth that transmit the power rather than friction like a V belt setup.
Cheers
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Mike Murphy
Melbourne Australia
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